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Why is ideal supersonic diffuser not feasible?

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Why is ideal supersonic diffuser not feasible?

(a) Presence of shock waves

(b) Varying cross – sectional area

(c) Varying throat area

(d) Choked flow

I got this question in an international level competition.

My doubt stems from Compressible Flow through Diffusers topic in portion Compressible Flow through Nozzles, Diffusers and Wind Tunnels of Aerodynamics

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Correct option is (a) Presence of shock waves

For explanation: Due to the presence of oblique shock waves on the convergent portion, the ideal supersonic diffuser is far from achievable. This contributes to the breaking of the isentropic flow characteristics according to which the entropy in the diffuser is constant. In fact, the flow in reality is viscous and there is an increase in entropy near the boundary layer.

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